Analysis and Design of a Self-Excitation Scheme for an Open-end Armature Winding Wound-Rotor Synchronous Machine

초록

The proposed self-excitation scheme uses a two-inverter-fed third harmonic current to generate and control a harmonic magnetic field in the airgap for self-excitation through voltage induction in a rotor-mounted harmonic winding. Two inverters feed three-phase composite currents and a zero-sequence third harmonic current to the open-end armature winding, thereby establishing an intended harmonic magnetic field. The harmonic winding on the rotor intercepts the harmonic magnetic field caused by the relative motion of the rotor at synchronous speed to induce voltage. At zero speed a pulsating harmonic field links to the rotor harmonic winding to induce voltage. Eventually, this voltage is used to drive field current for self-excitation, which is connected to the harmonic winding through an uncontrolled rotor-mounted rectifier. 2D finite element analysis in ANSYS Maxwell is carried out, and electromagnetic performance is evaluated to verify the theory. © 2024 IEEE.

키워드